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-std=gnu99

I've made libc compile using -std=gnu99 now.  This didn't require changing
any code (nor was it required to make any code work), though some tiny nits
were changed because of new warnings.  It just keeps us on our toes and
reflects the fact that ISO C99 with GNU extensions is the dialect in which
libc is written.  In writing new libc code we are free to use C99
constructs that GCC's default mode (-std=gnu89) won't accept.

However, there are now some new spurious warnings about use of the `a' flag
in scanf formats.  GCC's format checker can't distinguish between the
pre-1999 GNU extension `a' flag for string formats and the ISO C99 new `a'
format specifier for floats, and under -std=gnu99 it sees any format
starting with `%a' as the latter.  The runtime format parser has no trouble
with either, and no valid syntax is actually ambiguous.
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